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Fwd: 912ULS fuel return line orifice size

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peterz(at)zutrasoft.com
Guest

Posted: Fri Dec 04, 2020 4:44 am Post subject: Fwd: 912ULS fuel return line orifice size

Looks like this is a very old question - and that Europa supplied larger restrictors.  Very odd.

http://forums.matronics.com/viewtopic.php?p=403137



---------- Forwarded message ---------

From: Pete Zut <peterz(at)zutrasoft.com (peterz(at)zutrasoft.com)>

Date: Fri, Dec 4, 2020 at 7:39 AM

Subject: 912ULS fuel return line orifice size

To: europa-list <europa-list(at)matronics.com (europa-list(at)matronics.com)>



Hi Folks,

I'm currently re-doing my fuel lines and configuration and have discovered my return orifice was made at 1/32" or 0.68mm which is twice the size of the spec'd rotax 0.33 mm or 1/64".  It may explain why whenever I turned the electric pump off the pressure would drop to near zero for a couple seconds before recovering to the expected 4-5psi.





Curious what size other folks are running? 0.33mm?

Cheers and thanks,

Pete Z.

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rowlandcarson(at)gmail.co
Guest

Posted: Fri Dec 04, 2020 5:12 am Post subject: Fwd: 912ULS fuel return line orifice size

Pete - yes, apparently the restrictor with the larger orifice supplied by the Europa factory was intended to reduce vapour lock issues. See my journal for 20th & 21st June 2013:



http://www.rowlandcarson.org.uk/aviation/europa_435/201306.php



in friendship



Rowland

 	  Quote: 	
		   On 2020-12-04, at 12:42, Pete Zut <peterz(at)zutrasoft.com> wrote:

 

 Looks like this is a very old question - and that Europa supplied larger restrictors.  Very odd.

 

 http://forums.matronics.com/viewtopic.php?p=403137

 

 ---------- Forwarded message ---------

 From: Pete Zut <peterz(at)zutrasoft.com>

 Date: Fri, Dec 4, 2020 at 7:39 AM

 Subject: 912ULS fuel return line orifice size

 To: europa-list <europa-list(at)matronics.com>

 

 

 Hi Folks,

 

 I'm currently re-doing my fuel lines and configuration and have discovered my return orifice was made at 1/32" or 0.68mm which is twice the size of the spec'd rotax 0.33 mm or 1/64".  It may explain why whenever I turned the electric pump off the pressure would drop to near zero for a couple seconds before recovering to the expected 4-5psi.

 

 

 Curious what size other folks are running? 0.33mm?

 

 Cheers and thanks,

 Pete Z.

 


	


| Rowland Carson          ... that's Rowland with a 'w' ...

| <rowlandcarson(at)gmail.com>            http://www.rowlandcarson.org.uk

| Skype, Twitter: rowland_carson      Facebook: Rowland Carson

- The Matronics Europa-List Email Forum -

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

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